Hackintosh / Windows dual boot GPU issue

Slazeus · May 30, 2019

Hi folks,

So I setup a high sierra hackintosh yesterday on a separate drive to windows 10. At first I was having issues when trying to boot directly from the macOS drive from the clover boot manager after installation. I decided (as I thought would likely be the case before I started) that my rtx 2080 was causing it not to boot past the apple logo.

I was correct. When I remove the card completely it works beautifully. Boots fine. No network or sound issues or anything. Just fast snappy Hackintosh goodness. So I figure I'll plug the card back in for when I'm on windows (which is the majority of the time for gaming and such) and just enable onboard graphics in the bios for when I boot into MacOS.

This didn't work though and even though the video is going through the MoBo graphics just having the GPU hooked up is enough to stop MacOS from getting past the apple logo.

So, finally my question. Is there a way I can disable the graphics card on a software level for when I want to boot macOS but not have to remove the entire card and still be able to boot to windows with the card enabled.

Also something else I noticed was when I have onboard graphics enabled (the iGPU thing that lets you do multi monitor between onboard and dedicated graphics) but the cables plugged into the graphics card my MoBo spits out a 99 error code and doesn't post. I have to have the cable going into the MoBo first, boot to windows from the clover boot manager and then change the cable over to the graphics card.

My secondary question is if there is a way I can then keep the onboard graphics enabled for macOS but be able to boot with the GPU anyway to avoid plugging and unplugging cables every time I boot to avoid sockets wearing out.

If you got this far, thanks for talking to read this :)